EmbeddedPkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / EmbeddedPkg / EmbeddedMonotonicCounter / EmbeddedMonotonicCounter.c

/** @file\r
\r
  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Uefi.h>\r
\r
#include <Library/BaseLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/UefiBootServicesTableLib.h>\r
#include <Library/UefiRuntimeServicesTableLib.h>\r
\r
#include <Protocol/MonotonicCounter.h>\r
\r
UINT64 gCurrentMonotonicCount = 0;\r
\r
EFI_STATUS\r
EFIAPI\r
GetNextMonotonicCount (\r
  OUT UINT64  *Count\r
  )\r
{\r
  if (Count == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  *Count = gCurrentMonotonicCount++;\r
  return EFI_SUCCESS;\r
}\r
\r
EFI_STATUS\r
EFIAPI\r
GetNextHighMonotonicCount (\r
  OUT UINT32  *HighCount\r
  )\r
{\r
  if (HighCount == NULL) {\r
    return EFI_INVALID_PARAMETER;\r
  }\r
\r
  gCurrentMonotonicCount += 0x0000000100000000ULL;\r
\r
  *HighCount = (UINT32)RShiftU64 (gCurrentMonotonicCount, 32) & 0xFFFFFFFF;\r
\r
  return EFI_SUCCESS;\r
}\r
\r
\r
EFI_STATUS\r
EFIAPI\r
MonotonicCounterDriverInitialize (\r
  IN EFI_HANDLE        ImageHandle,\r
  IN EFI_SYSTEM_TABLE  *SystemTable\r
  )\r
{\r
  EFI_STATUS  Status;\r
  EFI_HANDLE  Handle = NULL;\r
\r
  // Make sure the Monotonic Counter Architectural Protocol is not already installed in the system\r
  ASSERT_PROTOCOL_ALREADY_INSTALLED(NULL, &gEfiMonotonicCounterArchProtocolGuid);\r
\r
  // Fill in the EFI Boot Services and EFI Runtime Services Monotonic Counter Fields\r
  gBS->GetNextMonotonicCount     = GetNextMonotonicCount;\r
  gRT->GetNextHighMonotonicCount = GetNextHighMonotonicCount;\r
\r
  // Install the Monotonic Counter Architectural Protocol onto a new handle\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &Handle,\r
                  &gEfiMonotonicCounterArchProtocolGuid,    NULL,\r
                  NULL\r
                  );\r
  return Status;\r
}\r